PERSONAL DE APOYO
PEREZ Miriam Cristina
congresos y reuniones científicas
Título:
Inhibition of marine biofouling by potassium sorbate lab-tests and field trials
Autor/es:
G. BLUSTEIN, M. T. GARCÍA, M. C. PÉREZ, B. DEL AMO, M. STUPAK
Lugar:
Kobe, Japan
Reunión:
Congreso; 14th International Congress on Marine Corrosion and Fouling (ICMCF).; 2008
Resumen:
INHIBITION OF MARINE BIOFOULING BY POTASSIUM SORBATE
LAB-TESTS AND FIELD TRIALS APPROACHESAPPROACHES
Guillermo Blustein, Mónica T. García, Miriam C. Pérez, Beatriz del Amo, Mirta Stupak
CIDEPINT (Centro de Investigación y Desarrollo en Tecnología de Pinturas) (CIC-CONICET)
52 e/ 121 y 122 La Plata Argentina
biofouling@cidepint.gov.ar
Traditionally, copper or organotin based coatings were commonly used to inhibit
biofouling on underwater structures. Although these paints are highly effective, they are
dangerous to the marine environment due to they affect a wide spectrum of non-target
organisms. New trends in antifouling technology are focused to the use of
environmental friendly-compounds.
As yet, the development of antifouling coatings based on natural products has not been
obtained at a commercial scale. In addition to its antifouling characteristics, products
must have properties that make them suitable, i.e. low toxicity, a broad spectrum of
activity against algae and invertebrates, low cost, etc. For this reason, we search for
another possibility for biofouling control. The aim of this study is to evaluate the
activity of potassium sorbate, a synthetic compound widely used as food preservative,
on larval survival of Balanus amphitrite through laboratory antifouling bioassays and
field trials.
In the lab potassium sorbate solutions ranged between 0.1 and 0.001M were prepared.
Toxicity and settlement tests were conducted using nauplii II and cyprids respectively,
and results were recorded after 24 h incubation. Significant differences between
treatment and controls were observed in solutions higher than 0.0125M, above this
concentration, solutions were effective in inhibiting both nauplii swimming movements
and cyprids attachment. When larvae were transferred to fresh artificial seawater they
could recover and follow their development, this observation confirms that the effect of
potassium sorbate is not permanent.
For field trials, potassium sorbate was entrapped into a non-toxic varnish. Acrylic panels
coated with the varnish were exposed in Mar del Plata harbour, Argentina. Biofouling
percentage cover was estimated after 15 days. A great decrease in micro and
macrofouling density and diversity in relation to controls was detected (p<0.05).. Although these paints are highly effective, they are
dangerous to the marine environment due to they affect a wide spectrum of non-target
organisms. New trends in antifouling technology are focused to the use of
environmental friendly-compounds.
As yet, the development of antifouling coatings based on natural products has not been
obtained at a commercial scale. In addition to its antifouling characteristics, products
must have properties that make them suitable, i.e. low toxicity, a broad spectrum of
activity against algae and invertebrates, low cost, etc. For this reason, we search for
another possibility for biofouling control. The aim of this study is to evaluate the
activity of potassium sorbate, a synthetic compound widely used as food preservative,
on larval survival of Balanus amphitrite through laboratory antifouling bioassays and
field trials.
In the lab potassium sorbate solutions ranged between 0.1 and 0.001M were prepared.
Toxicity and settlement tests were conducted using nauplii II and cyprids respectively,
and results were recorded after 24 h incubation. Significant differences between
treatment and controls were observed in solutions higher than 0.0125M, above this
concentration, solutions were effective in inhibiting both nauplii swimming movements
and cyprids attachment. When larvae were transferred to fresh artificial seawater they
could recover and follow their development, this observation confirms that the effect of
potassium sorbate is not permanent.
For field trials, potassium sorbate was entrapped into a non-toxic varnish. Acrylic panels
coated with the varnish were exposed in Mar del Plata harbour, Argentina. Biofouling
percentage cover was estimated after 15 days. A great decrease in micro and
macrofouling density and diversity in relation to controls was detected (p<0.05).Balanus amphitrite through laboratory antifouling bioassays and
field trials.
In the lab potassium sorbate solutions ranged between 0.1 and 0.001M were prepared.
Toxicity and settlement tests were conducted using nauplii II and cyprids respectively,
and results were recorded after 24 h incubation. Significant differences between
treatment and controls were observed in solutions higher than 0.0125M, above this
concentration, solutions were effective in inhibiting both nauplii swimming movements
and cyprids attachment. When larvae were transferred to fresh artificial seawater they
could recover and follow their development, this observation confirms that the effect of
potassium sorbate is not permanent.
For field trials, potassium sorbate was entrapped into a non-toxic varnish. Acrylic panels
coated with the varnish were exposed in Mar del Plata harbour, Argentina. Biofouling
percentage cover was estimated after 15 days. A great decrease in micro and
macrofouling density and diversity in relation to controls was detected (p<0.05).hen larvae were transferred to fresh artificial seawater they
could recover and follow their development, this observation confirms that the effect of
potassium sorbate is not permanent.
For field trials, potassium sorbate was entrapped into a non-toxic varnish. Acrylic panels
coated with the varnish were exposed in Mar del Plata harbour, Argentina. Biofouling
percentage cover was estimated after 15 days. A great decrease in micro and
macrofouling density and diversity in relation to controls was detected (p<0.05).entrapped into a non-toxic varnish. Acrylic panels
coated with the varnish were exposed in Mar del Plata harbour, Argentina. Biofouling
percentage cover was estimated after 15 days. A great decrease in micro and
macrofouling density and diversity in relation to controls was detected (p<0.05).
Because potassium sorbate is not lethal, it has an excellent potential as an antifouling agent.